高考问答水麒麟怎么打:几道非常简单的数学题目!!白给分啊!!!
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1.已知x+y=1/2,那么1/4x^2+1/2xy+1/4y^2的值为______.
2.单项式-1/3x^a+b y^a-1与3x^2 y是同类项,则a-b的值为( )
A.2 B.0 C.-2 D.1
3.已知a+b=m.ab=-4,化简(a-2)(b-2)的结果是( )
A.6 B.2m-8 C.2m D.-2m
4.已知a=1/20x+1,b=1/20+19,c=1/20x+21,那么多项式a^2=b^2=c^2-ab-bc-ac的值是( )
A.4 B.3 C. 2 D.1
2.单项式-1/3x^a+b y^a-1与3x^2 y是同类项,则a-b的值为( )
A.2 B.0 C.-2 D.1
3.已知a+b=m.ab=-4,化简(a-2)(b-2)的结果是( )
A.6 B.2m-8 C.2m D.-2m
4.已知a=1/20x+1,b=1/20+19,c=1/20x+21,那么多项式a^2=b^2=c^2-ab-bc-ac的值是( )
A.4 B.3 C. 2 D.1
全C肯定会对一道